Largest box that can be made from rectangular cardboard
Problem
Mar wants to make a box with no lid from a rectangular sheet of cardboard that is 18 inches by 24 inches. The box is to be made by cutting a square of side x from each corner of the sheet and folding up the sides. Find the value of x that maximizes the volume of the box.
| A. 4.3 inches | C. 10.6 inches |
| B. 5.2 inches | D. 3.4 inches |